The human cell

The video explains the journey from a single cell to a fully developed human being. It begins with the fusion of an egg and sperm to form a zygote, which then undergoes multiple cell divisions. As the cells multiply, they differentiate into various types, forming tissues and organs. By 12 weeks, the heart starts beating, and by 20 weeks, features like teeth and fingernails develop. At birth, the human body consists of approximately 10 trillion cells, showcasing the remarkable growth from a single cell.

What is the initial stage of human life as described in the text?

How many cells were present at three days old?

What types of cells were developed by three weeks?

At what week did the heart start to beat?

How many cells were present by the time of birth?